Metallic extension-screen.



PATENTED MAR. 17, 1908. T. LIMOGE. METALLIC EXTENSION SCREEN.

APPLICATION FILED DBO 19 190e 2 SHEETS-SHEET Z.

VMON T.

ILL@

th 100 .and much- 'mgg me Ouer u the bop and 105 @n me: inn

bow

sheet 1 k comp ach screen 90?) non. mw o the and 1^ ion being .an

15W@ @mme/fe; m

45 blau;

reise, their top and bottom bers lyingT side by tact, es indicated nt EFig. 2. in this oonstruction the principal function ot the clips is tohold togetherthe side tietjes of the top end bottoni trsnie bers oli thescreen sections against lateral separntion. So loner as they are thusheld together, the tongue and groove connection between them due to theengagement of the haternll)Y protrudiin,y corrugntions C on theotherwise flut-folded top and bottoni bars, will insure the even andmsj; sliding movement of the sereen sections on one another.

The 'form and arrangement of the corrugations C permit them to be formedat one operation by pressure in e die. press after the parts of thetrame have been completely assembled, this being' due to the fact thatthe)v laterally rotrude from one lince ol" the otherwise tint- 'oldedtraine bers between and parallel with the inner and outer edges of theseme. In this construction when the vtrame sections are fittedtoellether the)Y ere put together faceside, and consequentlyY someretaining); de- Vices, such ns the clips above referred to, areindispensable to hold them together and prevent their lateralseparation. T his construction of traine sections permits of theexpeditious, eeonolnionl ano eiieient nininr'ncture and assembling' olithe ports o?" 'the screen.. The unbound edges of the Wire cloth end theends ot the centeiron which binds its inner vertical edge are, Withoutoth r vfastening", see curely locked in plane by end duringT the nctionof the press which at one operation closes the i'olds ot the berst-igl'itly4 upon them, flattens and oonsolidetes the three trarne bars,end forms therein the corrug'etions 'C Which serve es the lool: to bold'the wire cloth as Well ns the center iron Y which Aforms the fourthside or the freine. Eril that remains after this is to tit togeth Ar thetwo freine seotions andproperly,T bend over their clips i).

prefer to torni the end and top end bote torn bars ot each freinesection integral of one continuous strip of sheet metal, the folds oflwhich are so leid to ermit the subsequent ready insertion of the clothun d "i eenteriron which binds its exposed edge. To secure this result iproceed es follows: i take e short strip ot" sheet nietu--prelerul)lysheet stoel-oic s Width ide, when folded on itself longitudinnh trip oftrie width dosired for the freine bers, und lonen enough to provide,When folded or bent transversely, en end bar and top end bottom bars ot'the length desired for tbe-freine bers. Such n sheet metal stri p isshown in el.

The central longitudinal line of told is im diceted by the dot-ted linei. The two sets of diagonal lines 2, 2, 3, 3, indicate the lines ot foldnt the two corners. At each corner, the longitudinal lines 2, 2, nre onopposite sides of the central line 1 and 'meet et n. point on that line,"forming with one another un obtuse angle. Similarly the di 'gourd linesare. on opposite sides ot 'the central. line l and form with one anotheren obtuse :ingle the apex of which meets in line i the spe); of theangle formed by the two line-s 2, -the four lines 2, 2, 3, 3, thusmeetingT et :t common point in the line l, which point defines the outerend the corner in the folded traine. The bend along the angular lineI oftold f2, Z, is inward in at direction opposite to that along the angulnrline of liold 3, 3, which is outward.

in Fig. 5 the strip is shown longitudinally 'folded along the centerline l this beingl to show the tongues D (forming the olipshereinbet'ore referred to) which ton nies are punched out from the sheetnieta on one side of the central line l, at or neer each end of thestrip along line 4 (Fig. e), and are thenl bent up, as shown. rThe outs4, i do not eritend to the on ter edge of the strip, thus leeving intactthe outer portion D hereiubefore referred to.

in Fig'. t5, the blank is partly folded and bent, in order to show morecleerttT how the folds nre int-tde and laid The ends of the top endbottom bers A lie between the folds of the, end bei* B; end thetriangular pieces et each corner included on eeoh side of the eenterline i, between the lines 2, 3, are leid between the outer feces ot thetop sind bottoni A and the interior opposite 'feces ot the folds of theend bar B, oleoriy indicated in the figure. The thus-folded strip,pressed down and llettened, is shown in ig.

represented es To complet-e the screen section, the wire cloth (with.its Hcenter iron7 binding) insorted between the folds of the soreen heretroni Ythe open end et' the Yhren-ie end pushed book into pinne. will.be noted that the folds here been so leid in the freine, that there isno interior opposed edge obstruet the passage of the Creen Cloth *oineet and eeh s oi the sind ends oli; the neuter iron heir properiosition between tl'iefolds of the wire sloth and oenter iron beve beeninserted into their plnee7 the screen freine is placed in a press bywhich its top and bottom bers and end bnr are corrugated :is elrendydescribed, these corrug-ations serving the several purposes hereinbeforementioned. The soreen sections are vthen put together and the cliptongues D are bent over to hold the two together if desired, rivets maybe en'iployed nt the corners, es indicated :it .1^ to hold the foldstogether more closely nt these points, do also the. end bars B of thescreen sections, may be bent along their outer edges et right ongles tothe body of the ber, as indicated :it c, Fig. l, to give the s'oreenwider end bearings, as well es to stiiien the bers. These {lange-likeedges c ere folded haelt in sueh direction that earch will stond in theof lvlw top nud lmlltmn other mw-l10n, und will ngznnsl lurllwr unvurdath of movemcut l'lmno hars nl lh@ thus wm :L stm) movement allor rh@www hun` hmm vlvsxd to a predvlvminrfd rnxtfrrr. llfthou' 5mm@ suchStor), thv Servon Svclirfms might mmfinally they* 'would dum' apurl.

integral with lh@ shout mvtnl l'rzm'm lmrsl ,Wil/l1 whivh they :,lruassorlalrd.

und hvlll hvwlwn thv l'wlds olt lhu frame 'hars [l in thv hmm have whichsvc/urn the wir@ Clolh und lts (-mltvr 'mm h1 place hvtwcvn thv` c0111-prvssud folds of thev hmm` hars und servi? also :1s :1 lulurzxl lungh@:md groove connection hul-www1 lhn wvvrlnpplllg sido faces 0l" Llw mpand lmltmn hars 0l" the frank, 5&0-- lluus., und vlipf,` l) for holdingtogether tho frumv sm'llmns n dnius lad/oral snparutiou.

2. ln :1 uwtlllllf, vxtvnslon scrcn uompuscd ol smflluns sliding m1. onezulotlwr, wp und hmmm wallon fram(i hars ol" folded l. .ln :l metallic,ail-mxslon rjcrwn, lhrvn; mudo from Ono sided frame sections machcontluuoug stri? nl' mctul lungltuflmrlly folded upon its@ l :rnd thanheut and foldod trnlnsversrly ol 115s length to lmm thv` bud bar B undfop and holtom lmrs .ll wire l l l l

